The acquisition was previously announced in June 2021 for a price of $1.15 billion.
The firm estimates 2022 production from the purchased assets will total 200 MBOED.
The deal is intended to empower game developers, artists and consumer content creators with content creation tools used in film and television.
The deal will strengthen ClearStar’s ability to operate coast-to-coast and expand its customer service capabilities.
This is the sixth acquisition made by Prometheus Group since being acquired by Genstar Capital in 2019.